If you leave your slides out, particularly while storming and at night you will dramatically increase heat loss. If you can place some throw rugs on the floor to further insulate the rig. Plug up all cieling vents (great heat loss and cold gain). Open closet doors to bathroom & kitchen sink areas to get heat circulation to pipes. Keep water heater on propane. Pour all hot dishwater down the toilet to add in keeping tank from freezing. If you need to lower leveling jacks put some wood between the jack and the ground to keep them from sticking. Make sure all of your batteries are properly filled (not over filled). Make sure your rig's propane tank is full...you will go through lots of propane with your space heater running. Finally, we always draw our drapes & blinds etc about 4:00pm. Enjoy, get cozy and pop a tall one.